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BU4233 数据表(PDF) 7 Page - Rohm

部件名 BU4233
功能描述  Low Voltage Free Delay Time Setting CMOS Voltage Detector IC Series
Download  12 Pages
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制造商  ROHM [Rohm]
网页  http://www.rohm.com
标志 ROHM - Rohm

BU4233 数据表(HTML) 7 Page - Rohm

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Technical Note
7/11
BU42□□G series, BU42□□F series, BU42□□FVE series,
BU43□□G series, BU43□□F series, BU43□□FVE series
www.rohm.com
2009.11 - Rev.C
© 2009 ROHM Co., Ltd. All rights reserved.
2) Examples of the power supply with resistor dividers
In applications where the power supply input terminal (VDD) of an IC with resistor dividers, it is possible that a through
current will momentarily flow into the circuit when the output logic switches, resulting in malfunctions (such as output
oscillatory state).
(Through-current is a current that momentarily flows from the power supply (VDD) to ground (GND) when the output level
switches from “High” to “Low” or vice versa.)
Fig.20
A voltage drop of [the through-current (I1)] × [input resistor (R2)] is caused by the through current, and the input voltage
to descends, when the output switches from “Low” to “High”. When the input voltage decreases and falls below the
detection voltage, the output voltage switches from “High” to “Low”. At this time, the through-current stops flowing through
output “Low”, and the voltage drop is eliminated. As a result, the output switches from “Low” to “High”, which again
causes the through current to flow and the voltage drop. This process is repeated, resulting in oscillation.
Consider the use of BU42□□ when the power supply input it with resistor dividers.
Fig.21 Current Consumption vs. Power Supply Voltage
* This data is for reference only.
The figures will vary with the application, so please confirm actual operating conditions before use.
VOUT
R2
VDD
BU42□□
BU43□□
GND
R1
I1
V1
CIN
CL
IDD
VDD
VDET
0
Through
Current
VDD - IDD Peak Current Ta=25
°C
0.001
0.01
0.1
1
10
34
56
78
9
10
VDD[V]
BU43xx
BU42xx
BD52xx
BD53xx
Temp - IDD(BU42xx)
0.0
0.5
1.0
1.5
2.0
2.5
-50 -30 -10
10
30
50
70
90
110 130
Temp
VDD3V
VDD6V
VDD7V
VDD4V


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